Research from coal fields show that increased production from coal mines resulted in a wider pit. Changes in the water catchment area resulted in changes in the calculation of mine water volume. Excessive mine water volume affects mining activities. Large amounts of water in the pit causes disruption in excavation and loading and hauling activities. Therefore, the design of mine drainage systems is required. The purpose of the study is to analyse statistically the parameters of the mine drainage system, and to design the mine drainage system; including open drain, sump, and settling pond. The research tools used include the calculation of runoff water discharge that requires statistical analysis for rainfall data processing and the determination of catchment area (CA). The open channel dimension and settling pond design is based on the sump volume calculation. The research area has high rainfall clased for the particle to settle is 30.38 minutes. The percsification, solid percent 2.66 % with settling rate 0.0027 m/s; the time requirentage of theoretically suctioned particle is 83 %, and the settling pond maintenance time that has 4 compartments is 15, 16, 19, and 23 days.

ABSTRAKAir asam tambang (AAT) merupakan air dengan kandungan pH rendah (di bawah 5) yang ditimbulkan akibat industri pertambangan. AAT terbentuk dari bertemunya tiga komponen, yaitu batuan yang mengandung sulfat, air dan udara. Batuan yang mengandung asam (potential acid foarming) yang terkupas selama kegiatan penambangan dapat membentuk AAT setelah bertemu udara dan air yang berasal dari paparan air hujan langsung, air limpasan dan rembesan air tanah. Air limpasan yang tercemar tersebut mempunyai pH sekitar 2 – 4 dengan kandungan logam berat berupa Al, Fe, Mn, Cu dan Zn. Metoda dalam pengelolaan AAT terdiri dari sistem aktif dan sistem pasif. Paper ini membahas mengenai pengelolaan AAT dengan menggunakan sistem pasif wetland. Cakupan yang dibahas menyajikan beberapa hal terkait wetland diantaranya: ukuran wetland dan desain wetland yang tepat termasuk keasaman air yang keluar dari tambang (pH), kondisi reaksi oksidasi, laju aliran air serta waktu yang diperlukan dalam proses wetland serta luasan area yang tersedia untuk konstruksi wetland. Manfaat yang dihasilkan dari studi ini dapat digunakan untuk penelitian selanjutnya dalam rangka program penutupan tambang tembaga dan emas.Kata kunci: wetland, remediasi pasif, air asam tambang (AAT) Acid mine drainage (AMD) is the most significant environmental pollution problem with a low pH (below 5) caused by the mining industry. AMD is former from three components, exposed acid rock contain sulphate, water and air. The exposed acid rocks (potential acidic forming) during mining activities create a chemical reaction with air and water can be from seepage and run off. The water overflow from pit lake has a pH around 2 – 4 and contain heavy metals, i.e. Al, Fe, Mn, Cu, and Zn. The methods of AMD treatments that are active and passive systems. This paper discusses the AMD treatment using passive wetland system. Main factors passive removal of acidity and heavy metals using wetlad system when determining type and size appropriate wetland system include the influent acidity, pH, redox state, water flow rates and retention times, the area available for wetland. The benefits of this  study for passive AMD treatment using wetland can be used for further research to supporting the copper and gold mine closure program. Keywords: wetland, passive reamediation, acid mine drainage

Groundwater from underground rivers is one of the potential raw water sources in the karst area. Research to exploit the potential sources of water from underground rivers in karst areas is very important. Utilization of water resources should be based on technique, environmental and social conditions. The problems are to find the groundwater river flows, to design a well installation, to determine the feasibility, and to manage the water use. Analysis of the results of geological mapping, topography, geophysical measurements, drilling, pipeline and electrical survey, and pumping tests produce the feasibility of the water utilization. Geoelectric data indicates there is a saturated zone at a depth of about 70-90 m from the surface. Well construction is implemented by using a 83 m PVC (Polyvinyl Chloride) pipe and a 15 m screen length. The groundwater level remains stable even though it has been pumped with a maximum discharge of 5 liters/sec. Based on the elevation difference from topographic mapping results, the number of booster pumps can be calculated. Utilization of water from underground rivers can overcome the problem of water shortage in dry area.